Help needed ASAP

didnt get much of a response on the high rear end so..
My idea is to get underneath and try to bleed the pressure until it levels out. Problem is I dont know exactly which line that would bleed the pressure.
I wanted to know if anyone had any knowledge of the system..? and can instruct me on which line to bleed.

i dont know what all there is to your system, but sometimes on semi's , leveling valves go wacky and may cause front axle to be higher or lower then rear or the truck may lean, so, check and see if it has a leveling valve for the air suspension

Did you ever get your high rear end figured out? I have the same problem. I'm getting a DTC C 1770 which is a stuck vent solenoid. Still trying to figure out how to drop her.

Never mind, I fixed it.